diff --git a/NzbDrone.Api/Indexers/IndexerModule.cs b/NzbDrone.Api/Indexers/IndexerModule.cs
index fd19ea4a1..3c3601c25 100644
--- a/NzbDrone.Api/Indexers/IndexerModule.cs
+++ b/NzbDrone.Api/Indexers/IndexerModule.cs
@@ -1,11 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using FluentValidation.Internal;
 using NzbDrone.Api.ClientSchema;
 using NzbDrone.Api.Mapping;
 using NzbDrone.Api.REST;
-using NzbDrone.Api.Validation;
 using NzbDrone.Core.Indexers;
 using Omu.ValueInjecter;
 using FluentValidation;
@@ -28,8 +26,6 @@ namespace NzbDrone.Api.Indexers
             SharedValidator.RuleFor(c => c.Name).NotEmpty();
             SharedValidator.RuleFor(c => c.Implementation).NotEmpty();
 
-            SharedValidator.RuleForField<string>(c=>c.Fields,"Url").NotEmpty();
-
             PostValidator.RuleFor(c => c.Fields).NotEmpty();
         }
 
@@ -67,6 +63,9 @@ namespace NzbDrone.Api.Indexers
             var indexer = _indexerService.Get(indexerResource.Id);
             indexer.InjectFrom(indexerResource);
             indexer.Settings = SchemaDeserializer.DeserializeSchema(indexer.Settings, indexerResource.Fields);
+
+            ValidateSetting(indexer.Settings);
+
             indexer = _indexerService.Update(indexer);
 
             var response = indexer.InjectTo<IndexerResource>();
@@ -75,6 +74,17 @@ namespace NzbDrone.Api.Indexers
             return response;
         }
 
+
+        private static void ValidateSetting(IIndexerSetting setting)
+        {
+            var validationResult = setting.Validate();
+
+            if (!validationResult.IsValid)
+            {
+                throw new ValidationException(validationResult.Errors);
+            }
+        }
+
         private Indexer GetIndexer(IndexerResource indexerResource)
         {
             var indexer = _indexerService.Schema()
@@ -90,6 +100,8 @@ namespace NzbDrone.Api.Indexers
             indexer.InjectFrom(indexerResource);
             indexer.Settings = SchemaDeserializer.DeserializeSchema(indexer.Settings, indexerResource.Fields);
 
+            ValidateSetting(indexer.Settings);
+
             return indexer;
         }
 
diff --git a/NzbDrone.Api/Validation/RuleBuilderExtensions.cs b/NzbDrone.Api/Validation/RuleBuilderExtensions.cs
index f14c833bd..23dc34c77 100644
--- a/NzbDrone.Api/Validation/RuleBuilderExtensions.cs
+++ b/NzbDrone.Api/Validation/RuleBuilderExtensions.cs
@@ -1,4 +1,5 @@
-using FluentValidation;
+using System.Text.RegularExpressions;
+using FluentValidation;
 using FluentValidation.Validators;
 
 namespace NzbDrone.Api.Validation
@@ -14,5 +15,10 @@ namespace NzbDrone.Api.Validation
         {
             return ruleBuilder.SetValidator(new EqualValidator(0));
         }
+
+        public static IRuleBuilderOptions<T, string> HaveHttpProtocol<T>(this IRuleBuilder<T, string> ruleBuilder)
+        {
+            return ruleBuilder.SetValidator(new RegularExpressionValidator("^http(s)?://", RegexOptions.IgnoreCase)).WithMessage("must start with http:// or https://");
+        }
     }
 }
\ No newline at end of file
diff --git a/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj b/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
index a65e1eb59..963f7702d 100644
--- a/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
+++ b/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
@@ -55,6 +55,9 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\FluentMigrator.1.1.1.0\tools\FluentMigrator.Runner.dll</HintPath>
     </Reference>
+    <Reference Include="FluentValidation">
+      <HintPath>..\packages\FluentValidation.4.0.0.1\lib\Net40\FluentValidation.dll</HintPath>
+    </Reference>
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="Microsoft.Practices.ServiceLocation, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
diff --git a/NzbDrone.Core.Test/packages.config b/NzbDrone.Core.Test/packages.config
index d5925e31a..0881c7fe5 100644
--- a/NzbDrone.Core.Test/packages.config
+++ b/NzbDrone.Core.Test/packages.config
@@ -4,6 +4,7 @@
   <package id="CommonServiceLocator" version="1.0" targetFramework="net40" />
   <package id="FluentAssertions" version="2.0.1" targetFramework="net40" />
   <package id="FluentMigrator" version="1.1.1.0" targetFramework="net40" />
+  <package id="FluentValidation" version="4.0.0.1" targetFramework="net40" />
   <package id="Moq" version="4.0.10827" />
   <package id="NBuilder" version="3.0.1.1" />
   <package id="NCrunch.Framework" version="1.46.0.9" targetFramework="net40" />
diff --git a/NzbDrone.Core/Indexers/IIndexerSetting.cs b/NzbDrone.Core/Indexers/IIndexerSetting.cs
index a979b3531..078b18ff5 100644
--- a/NzbDrone.Core/Indexers/IIndexerSetting.cs
+++ b/NzbDrone.Core/Indexers/IIndexerSetting.cs
@@ -1,26 +1,20 @@
-namespace NzbDrone.Core.Indexers
+using FluentValidation.Results;
+
+namespace NzbDrone.Core.Indexers
 {
     public interface IIndexerSetting
     {
-        bool IsValid { get; }
+        ValidationResult Validate();
     }
 
 
     public class NullSetting : IIndexerSetting
     {
-        public static NullSetting Instance = new NullSetting();
-
-        private NullSetting()
-        {
-
-        }
+        public static readonly NullSetting Instance = new NullSetting();
 
-        public bool IsValid
+        public ValidationResult Validate()
         {
-            get
-            {
-                return true;
-            }
+            return new ValidationResult();
         }
     }
 }
diff --git a/NzbDrone.Core/Indexers/IndexerService.cs b/NzbDrone.Core/Indexers/IndexerService.cs
index 3a4860cbb..168835ffa 100644
--- a/NzbDrone.Core/Indexers/IndexerService.cs
+++ b/NzbDrone.Core/Indexers/IndexerService.cs
@@ -53,7 +53,7 @@ namespace NzbDrone.Core.Indexers
 
         public List<IIndexer> GetAvailableIndexers()
         {
-            return All().Where(c => c.Enable && c.Settings.IsValid).Select(c => c.Instance).ToList();
+            return All().Where(c => c.Enable && c.Settings.Validate().IsValid).Select(c => c.Instance).ToList();
         }
 
         public Indexer Get(int id)
diff --git a/NzbDrone.Core/Indexers/Newznab/NewznabSettings.cs b/NzbDrone.Core/Indexers/Newznab/NewznabSettings.cs
index 30e142e23..7cac534ec 100644
--- a/NzbDrone.Core/Indexers/Newznab/NewznabSettings.cs
+++ b/NzbDrone.Core/Indexers/Newznab/NewznabSettings.cs
@@ -1,6 +1,9 @@
 using System;
 using System.Collections.Generic;
+using FluentValidation;
+using FluentValidation.Results;
 using NzbDrone.Core.Annotations;
+using NzbDrone.Core.Validation;
 
 namespace NzbDrone.Core.Indexers.Newznab
 {
@@ -8,7 +11,8 @@ namespace NzbDrone.Core.Indexers.Newznab
     {
         public NewznabSettings()
         {
-            Categories = new [] { 5030, 5040 };
+            Categories = new[] { 5030, 5040 };
+            //RuleFor(c => c.Url).ValidRootUrl();
         }
 
         [FieldDefinition(0, Label = "URL")]
@@ -26,5 +30,11 @@ namespace NzbDrone.Core.Indexers.Newznab
                 return !string.IsNullOrWhiteSpace(Url);
             }
         }
+
+        public ValidationResult Validate()
+        {
+            return new ValidationResult();
+            //return Validate(this);
+        }
     }
 }
\ No newline at end of file
diff --git a/NzbDrone.Core/Indexers/Omgwtfnzbs/OmgwtfnzbsSettings.cs b/NzbDrone.Core/Indexers/Omgwtfnzbs/OmgwtfnzbsSettings.cs
index a0e8fe815..b8ef34518 100644
--- a/NzbDrone.Core/Indexers/Omgwtfnzbs/OmgwtfnzbsSettings.cs
+++ b/NzbDrone.Core/Indexers/Omgwtfnzbs/OmgwtfnzbsSettings.cs
@@ -1,22 +1,28 @@
 using System;
+using FluentValidation;
+using FluentValidation.Results;
 using NzbDrone.Core.Annotations;
 
 namespace NzbDrone.Core.Indexers.Omgwtfnzbs
 {
-    public class OmgwtfnzbsSetting : IIndexerSetting
+    public class OmgwtfnzbsSetting : AbstractValidator<OmgwtfnzbsSetting>, IIndexerSetting
     {
+        public OmgwtfnzbsSetting()
+        {
+            RuleFor(c => c.Username).NotEmpty();
+            RuleFor(c => c.ApiKey).NotEmpty();
+        }
+
         [FieldDefinition(0, Label = "Username")]
         public String Username { get; set; }
 
         [FieldDefinition(1, Label = "API Key")]
         public String ApiKey { get; set; }
 
-        public bool IsValid
+
+        public ValidationResult Validate()
         {
-            get
-            {
-                return !string.IsNullOrWhiteSpace(Username) && !string.IsNullOrWhiteSpace(ApiKey);
-            }
+            return Validate(this);
         }
     }
 }
diff --git a/NzbDrone.Core/NzbDrone.Core.csproj b/NzbDrone.Core/NzbDrone.Core.csproj
index bc4e017d5..77753145a 100644
--- a/NzbDrone.Core/NzbDrone.Core.csproj
+++ b/NzbDrone.Core/NzbDrone.Core.csproj
@@ -67,6 +67,10 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\FluentMigrator.1.1.1.0\tools\FluentMigrator.Runner.dll</HintPath>
     </Reference>
+    <Reference Include="FluentValidation, Version=4.0.0.1, Culture=neutral, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\packages\FluentValidation.4.0.0.1\lib\Net40\FluentValidation.dll</HintPath>
+    </Reference>
     <Reference Include="Growl.Connector">
       <HintPath>..\packages\Growl.0.6\lib\Growl.Connector.dll</HintPath>
     </Reference>
@@ -490,6 +494,7 @@
     <Compile Include="Update\UpdatePackageProvider.cs" />
     <Compile Include="Update\UpdatePackage.cs" />
     <Compile Include="Update\UpdateCheckService.cs" />
+    <Compile Include="Validation\RuleBuilderExtensions.cs" />
   </ItemGroup>
   <ItemGroup>
     <BootstrapperPackage Include=".NETFramework,Version=v4.0,Profile=Client">
diff --git a/NzbDrone.Core/Validation/RuleBuilderExtensions.cs b/NzbDrone.Core/Validation/RuleBuilderExtensions.cs
new file mode 100644
index 000000000..6401fb475
--- /dev/null
+++ b/NzbDrone.Core/Validation/RuleBuilderExtensions.cs
@@ -0,0 +1,29 @@
+using System.Text.RegularExpressions;
+using FluentValidation;
+using FluentValidation.Validators;
+
+namespace NzbDrone.Core.Validation
+{
+    public static class RuleBuilderExtensions
+    {
+        public static IRuleBuilderOptions<T, int> ValidId<T>(this IRuleBuilder<T, int> ruleBuilder)
+        {
+            return ruleBuilder.SetValidator(new GreaterThanValidator(0));
+        }
+
+        public static IRuleBuilderOptions<T, int> IsZero<T>(this IRuleBuilder<T, int> ruleBuilder)
+        {
+            return ruleBuilder.SetValidator(new EqualValidator(0));
+        }
+
+        public static IRuleBuilderOptions<T, string> HaveHttpProtocol<T>(this IRuleBuilder<T, string> ruleBuilder)
+        {
+            return ruleBuilder.SetValidator(new RegularExpressionValidator("^http(s)?://", RegexOptions.IgnoreCase)).WithMessage("must start with http:// or https://");
+        }
+
+        public static IRuleBuilderOptions<T, string> ValidRootUrl<T>(this IRuleBuilder<T, string> ruleBuilder)
+        {
+            return ruleBuilder.SetValidator(new RegularExpressionValidator("^http(?:s)?://[a-z0-9-.]+", RegexOptions.IgnoreCase)).WithMessage("must be valid URL that");
+        }
+    }
+}
\ No newline at end of file
diff --git a/NzbDrone.Core/packages.config b/NzbDrone.Core/packages.config
index 760898188..6674b3182 100644
--- a/NzbDrone.Core/packages.config
+++ b/NzbDrone.Core/packages.config
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="FluentMigrator" version="1.1.1.0" targetFramework="net40" />
+  <package id="FluentValidation" version="4.0.0.1" targetFramework="net40" />
   <package id="Growl" version="0.6" />
   <package id="MediaInfoNet" version="0.3" targetFramework="net40" />
   <package id="Newtonsoft.Json" version="5.0.6" targetFramework="net40" />